1,6-DISUBSTITUTED-4H-5-{8 4,3-a{9 BENZODIAZEPINES

ABSTRACT

1,6-Disubstituted-4H-s-triazolo(4,3-a)(1,4)benzodiazepines of the formula II:   wherein R is an aromatic heterocyclic ring compound moiety selected from 2-, 3-, and 4-pyridyl, 2-thienyl, and 2-furyl; wherein R1 is selected from the group consisting of hydrogen and alkyl of one to three carbon atoms, inclusive; wherein R2, R3, R4, and R5 are selected from the group consisting of hydrogen, halogen, nitro, trifluoromethyl, and alkylthio in which alkyl is defined as above, are produced by condensing a 5-phenyl-1,3dihydro-2H-1,4-benzodiazepin-2-thione of the formula (I):   wherein R1, R2, R3, R4, and R5 are defined as above, with a hydrazine of the formula III:   in which R is defined as above. The new products of formula II including their pharmacologically acceptable acid addition salts and the N-oxides (in position 5) of II and the said salts are useful as sedatives, hypnotics, anticonvulsants, tranquilizers, and muscle relaxants in mammals and birds.

ijiaiteol States Patent [1 1 Szmusalrovica i,6-lDllSUBSTITUTED-4I l-5-[4,3-

AWENZODIAZEPINES [75] Inventor: Jacob Szmuszkovicz, Kalamazoo,

Mich.

[73] Assignee: The Upjohn Company, Kalamazoo,

Mich.

[22] Filed: July 19, 11973 21 Appl. No.: 380,666

Related US. Application Data [63] Continuation-in-part of Ser. No. 142,068, May l0,

1971, abandoned.

[52] US. Cl. 260/296 T, 71/90, 71/92, 260/239.3 D, 260/294.8 B, 260/295 H,

[51] int. Cl.. C07d 57/02, C07d 99/04, C07d 99/06 [58] lField of Search 260/294.8 B, 296 T, 308 R [56] References Cited UNITED STATES PATENTS 3,299,053 1/1967 Archer et a1. 260/239 BD 3,407,211 10/1968 Berger et a1 260/239 BD 3,741,957 6/1973 Hester 260/308 R FOREIGN PATENTS OR APPLICATIONS 2,012,090 9/1970 Germany .Q 260/308 R 6,916,543 5/1970 Netherlands 260/308 R Primary ExaminerAlton D. Rollins 57 ABSTRACT 1,6-Disubstituted-4H-s-triazolo[4,3- a][1,4]benzodiazepines of the formula II:

[4 1 Dec. 241, 1974 wherein R R R R and R are defined as above, with a hydrazine of the formula III:

R-i-NH-NHZ I m in which is defined as above.

The new products of formula II including their pharmacologically acceptable acid addition salts and the N-oxides (in position 5) of II and the said salts are useful as sedatives, hypnotics, anticonvulsants, tranquilizers, and muscle relaxants in mammals and birds.

10 Claims, No Drawings 1,s-msuBSTiTurED-m-s-[4,3-A] BENZODIAZEPINES cRoss REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of application Ser. No. 142,068, filed May 10, 1971, and now abandoned.

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention is directed to new organic compounds and is particularly concerned with novel 1,6

disubstituted-4l-l-s-triazolo[4,3- v a][a,4]benzodiazepines and a process for the production thereof.

The novel compounds and the process of production therefor can be illustratively represented as follows:

wherein R is an aromatic heterocyclic ring radicalselected from the group consisting of 2-, 3-, and 4- pyridyl, Z-thienyl and 2-furyl; wherein R R R and R areselected from the group consisting of hydrogen, halogen, nitro, trifluoromethyl, and alkylthio in which alkyl is defined as above; and wherein R, is selected from the group consisting of hydrogen and alkyl of one to three carbon atoms,inclusive.

The. more important compounds have the formula IlA wherein R is selected from the group consisting of 2-.

3-, and 4-pyridyl; and wherein R R R and R are selected from the group consisting of hydrogen, halo gen, and nitro, and the pharmacologically acceptable acid addition salts thereof and the 4-N-oxides thereof. The most valuable compounds have the formula 11B wherein R is selected from the group consisting of 2-, 3-, and 4-pyridyl; and wherein R and R are selected from hydrogen and chlorine, and the pharmacologically acceptable acid addition salts thereof.

The process of this invention comprises: condensing a 5substituted-l ,3-dihydro-2H-l ,4-benzodiazepine-2- thione of formula 1, in an organic solvent, e.g., a loweralkanol of one to four carbon atoms, inclusive, or cyclohexanol, with an acid hydrazide Ill, at a temperature between 60 and C.- and, if necessary, heating thereafter to l50-250 C. to give a diazepine of formula II, i.e. the corresponding l,6-disubstituted-4-Hstriazolo[4,3-a][1,4]ben2odiazepine (I1). Compounds of formula II'can be separated by conventional methods such as extraction, chromatography, crystallization and the like. The N-oxides are made in conventional manner e.g. by treatment of 11 in a lower alkanol solution e.g. in an ice-bath with a peracid e.g. mchloroperbenzoic acid.

DESCRIPTION OF THE PREFERRED I EMBODIMENT Lower alkyl groups OH to 3 carbon atoms, inclusive, are exemplified by methyl, ethyl, propyl, and isopropyl.

Halogen means fluorine, chlorine, and bromine.

The novel compounds of the formula 11, N-oxides,.

'mides, hydriodides, sulfates, phosphates, cyclohex anesulfamate's, methanesulfonates, and the like, prepared by reacting a compound of formula II with the selected pharmacologically acceptable acid.

. 3 Sedative effects of 8-chloro-l-(4-pyridyl)-6-phenyl- 4H-striazolo[4,3-a][1,4]benzodiazepin are shown by the following tests in mice:

Chimney test:

[Med. Exp. 4, 11 (1961)]: The effective intraperitoneal dosage for 50% of mice (ED is 5 'mg./kg. The test determines the ability of mice to back up and out of a vertical glass cylinder within 30 seconds. At the effective dosage, 50% of the mice failed doing it.

Dish test:

Mice in petri dishes cm. diameter, 5 cm. high,

partially embedded in wood shavings), climb out in a very short time, when not treated. Mice remaining in the dish for more than 30 minutes indicates tranquilization. ED equals the dose of test compound at which 50% of the mice remain in the dish. The ED (intraperitoneal administration) in this test was 4.5 mg/kg.;

Pedestal test:

The untreated mouseleaves the pedestal in less than a minute to climb back to the floor of the standard mouse box. Tranquilized mice will stay on the pedestal for more than 1 minute. The ED (intraperitoneal administration) is 3.6 mg./kg.

Nicotine antagonism test:

Mice in a group of 6 are injected with the test compound (8-chloro-l-(4-pyridyl)-6-phenyl-4l-l-striazolo[4,3-a][1,4]benzodiazepine). Thirty minutes.

later the mice including control (untreated) mice are injected with nicotine salicylate (2 mg./kg.). The control mice show overstimulation, i.e., (1) running con vulsions followed by (2) tonic extensor fits; followed by (3) death. An intraperitoneal dosage of 0.45 mg./kg. of the test compound protected 50% of the mice against (2) and 0.5 mg./kg. against (3) (ED Antagonism to strychnine (as sulfate):

The pharmaceutical forms contemplated by this invention include pharmaceutical compositions suited for oral, parenteral, and rectal use, e.g., tablets, powder packets, cachets, dragees, capsules, solutions, suspension, sterile injectable forms, suppositories, bougies, and the like. Suitable diluents or carrier such as carbohydrates (lactose), proteins, lipids, calcium phosphate, cornstarch, stearic acid, methylcellulose and the like may be used as carriers or for coating purposes. Water or oil, e.g., coconut oil, sesame oil, safflower oil, cottonseed oil, peanut oil may be used for preparing solutions or suspensions of the active drug. Sweetening, coloring, and flavoring agents may be added.

For mammals and birds food premixes, with starch. oatmeal, dried fishmeat, fishmeal, flour, and the like can be prepared.

As tranquilizer the compounds of formula ll, its pharmacologically acid addition salts and N-oxides thereof can be used in dosages of 005- mg./kg., with 0.1 to 2 mg./kg. preferred, in oral or injectable preparations as described above, to alleviate tension and anxiety in mammals, or birds, such as e.g., occurs when animals are in travel. In larger animals 5 kg. or over the lower dosage ranges are effective.

Other acid addition salts of the compounds of formula ll can be made such as the fluosilicic acid addition salts which are useful mothproofing compounds or'the trichloroacetates useful as herbicides against Johnson grass, Bermuda grass, yellow foxtail and green foxtail,

and quack grass. I

The starting materials of formula I of this invention, substituted or unsubstituted 1,3-dihydro-5-phenyl-2H- l,4-benzodiazepine-Z-thiones, are described by G. A. Archer and L. H. Sternbach [J. Org. Chem. 20, 231 (1964) and US. Pat. No. 3,422,091]. These compounds (l) are made by the reaction of the known substituted or unsubstituted l,3-dihydro-5-phenyl-2H-l ,4- benzodiazepin-Z-ones by heating with phosphorus pentasulfide in pyridine for about 45 minutes (Archer et al., ibid.). The following compounds of formula I are representative starting materials:

l,3-dihydro-5-phenyl-2H-l ,4-benzodiazepine-2- thione; 6-chloro-l ,3-dihydro-5-(m-bromophenyl)-2H-l ,4-

benzodiazepine-Z-thione;

7-chloro-l ,3-dihydro-5-phenyl-2H-l ,4-benzodiazepine-2-thione;

7-chloro-l ,3-dihydro-5-(o-chlorophenyl)-2H-l ,4-

. benzodiazepine-Z-thione;

8-chloro-l ,3-dihydro-5-phenyl-2H-l ,4-benzodiazepine-2-thione;

ED (in mg/kg.) COMPOUND Ch D P 8-chlorol 3-pyridyl)methyl-6- phenyl]-4H-s-triazolo[4.3-a]- Ch Chimney test D dish test P pedestal rest Ni nicotine antagonism (3) test 7-bromo-1,3-dihydro-5-phenyl-2H-1,4-benzodiaze- Y pine-Z-thione;

7-ch1oro-1,3-dihydro-5-(p-chlorophenyl)-2H-1,4-

benzodiazepine-Z-thione; 7-chloro-1,3-dihydro-5-(o-fluorophenyl)-2H-1,4-

benzodiazepine-2-thione; 7-chl0ro-1,3-dihydro-5-(orbromophenyl)-21-1-1 ,4-

benzodiazepine-2-thione; 3-ethyl-1,3-dihydro-5-(p-fluorophenyl)-2H-1,4-benzodiazepine-Z-thione; 7-nitro-3 -propyl-l ,3-dihydro-5-(o-chlorophenyl 2H-1,4-benzodiazepine-2-thione; 8-nitro-1,3-dihydro-5-(o-choropheny1)-2H-1,4-benzodiazepine-Z-thione; 7-bromo-1,3-dihydro-5-(o-bromophenyl)-2H-1,4-

benzodiazepine-Lthione; 7-methyl-1,3-dihydro-5-(o-chloropheny1)-2H-,l ,4-

benzodiazepine-2-thione; I 7methylthio-1,3-dihydro-5-phenyl-2H-1,4-benzodiazepine-Z-thione; 3-methyl-1,3-dihydro-5-(o-chlorophenyl-2H-1,4-

benzodiazepine-2-thione; 7-trifluoromethyl-1,3-dihydro-5-(o-chlorophenyl)- 2H-1,4-benzodiazepine-2-thione; 7-t1uorol ,3-dihydro-5-(o-ch1orophenyl)-21-1-1 ,4-

benzodiazepine-2-thione; 6,9-dichloro-1,3-dihydro-5-(p isopropylphenyl)-2H- 1,4-benzodiazepine-2-thione; 6-nitro-1 ,3-dihydro-5 (o-chloropheny])-2H- l ,4-benzodiazepine-Z-thione; and the like. The hydrazides 111:

wherein R is 2, 3 or 4pyridyl, 2-thienyl or 2-furyl are partially commercially available such as 2-furoic acid hydrazide, 2-thienoic acid hydrazide, nicotinic and The following examples are illustrative of the processes and products of the present invention, but are not to be construed as limiting.

A mixture of 7-chloro-5-phenyl-1 ,3-dihydro-1 ,4-benzodiazepine2-thione (5.74 g., 0.02 mole), isonicotinic acid hydrazide (8.23 g., 0.06 mole) and n-butyl alcohol (200 ml.) is refluxed for 2 hours. The solution is evaporated and the residue was dissolved in ml. of ether and 50 ml. of methylene chloride. The aqueous layer is extracted once with methylene chloride, and the combined organic layer was washed with ether (3 X 50 ml.) saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate and evaporated. The residue is dissolved in 25 ml. of ethyl acetate and the solution filtered to clarify. Ether (25 ml.) was added to the solution. The solution is again filtered to clarify and allowed to crystallize; 4.1 g. of 8-chloro-6- phenyl-l-(4-pyridyl)-4H-s-triazolo[4,3-

a][ 1 ,4]benzodiazepine of melting point 205-206.5 C. is obtained. The second crop is 0.89 g. of melting point 203204 (yield: 68%). The analytical sample is prepared by crystallization from ethyl acetate. It has a meltingpoint of 205.5206.5.

Anal. calcd. for cg HuclNgi C, 67.83; H, 3.79; Found: C, 67.82; H, 3.68;

EXAMPLE 2 evaporated and the mixture was dissolved in 50 ml. of

lected 1,3-dihydro-5-pheny1 21-1-1,4-benzodiazepine-2 thione (I) in an inert organic solvent, preferably in a lower-alkanol, e.g., methanol, ethanol, l-propanol, 2-

propanol, l-butanol, 2-butanol, or the like, with lbutanol preferred, is heated to between -120 C., preferably to the reflux temperature of the mixture, with the selected acid hydrazide R-CONH-NH (111) defined as above. In the preferred embodiment of this invention the acid hydrazide is used in excess, such as from two to five times the theoretically required amount, but the reaction is operative with smaller or larger amounts. The reaction period is between 1 and 48 hours. At the termination of the reaction the reaction mixture can be evaporated to give a crude material, which may be the final product 11or intermediate or a mixture of both. If it is the intermediate the crude product is heated above the melting point of compound 11 or heated to 150250 C. to give the compound of formula 11. The desired product 11 is isolated and purified by conventional procedures e.g. neutralization of the reaction mixture, extraction, chromatography, crystallization, and the like.

each water and methylene chloride. The organic layer is separated, washed withwater (4 X 25 'ml.), saturated salt solution, dried over anhydrous magnesium sulfate, and evaporated. The residue is crystallized from ethyl acetate-ether to give 5.25 g. (71% yield) of 8-chloro-6- phenyl-1-(3-pyridyl)-41-1-s-triazolo[4,3-

- a][1,4]benzodiazepine of melting point203-204, unchanged upon recrystallization from ethyl acetate.

Anal. calcd. for C H CIN c. 67.83; a, 3.79; CI. 9.53; N, 18.84 Found: c 67.95; H. 3.82; Cl. 9.23 N, 18.79

EXAMPLE 3 8-chloro-6-phenyl- 1-(2-pyridyl)-41-1-s-triazolo-[4,3- a] 1 ,4]benzodiazepine 200 ml. of n-butyl alcohol is refluxed for 21 hours. The solution is evaporated and the residue is dissolved in 50 ml. of water and 100 ml. of methylene chloride. The resulting organic layer is separated, washed with water (3 X 50 ml.). saturated salt solution, dried over anhydrous magnesium sulfate and evaporated. The residue is shaken with 50 ml. of each, water and ether, and the resulting solid is filtered, washed with water then ether. Crystallization from ethyl acetate-ether gives 4.8 g. (65% yield) of 8-chloro-6-phenyl-l-(2-pyridyl)-4H-striazolo[4.3-a][1,4]benzodiazepine of melting point 188.5190 C., raised to l89-190 on recrystallization from ethyl acetate-ether.

Anal. calcd. for C H CIN C. 67.83; H. 3.79; Cl. 9.53; N. 18.84. Found: C, 67.54; H. 3.86; Cl. 9.60; N. 18.75.

EXAMPLE 4 8- Chloro-6-(o-chlorophenyl)-1-(4-pyridyl)-4H-striazolo[4,3-a][1,4]benzodiazepine Anal. calcd. for C H CI N C, 62.08; H. 3.22; CI. 17.45; N. 17.25. Found: C. 61.71; H. 3.31; Cl. 17.73; N. 17.32.

EXAMPLE 5 8-Chloro- 1 2-furyl )-6 phenyl-4H-s-triazolo-[4,3- a 1,4]benzodiazepine A mixture of 7-chloro-l,3-dihydro-5-(phenyl)-2H- 1.4-benzodiazepine-Z-thione (5.74 g.. 0.02 mole), 2- furoic acid hydrazide 97.56 g., 0.06 mole) and 200 ml. of n-butyl alcohol is refluxed for 22 hours. The solution was evaporated and the residue was dissolved in methylene chloride and water. The resulting organic layer was separated. washed with water, dried over anhydrous magnesium sulfate and evaporated. The residue was shaken with 50 ml. of each, ether and water, and the resulting solid was filtered and washed with ether then with water. Crystallization from methylene chloride-ether gave 5.8 g. of the methylene chloride solvate of 8-chloro-1-(2-furyl) 6-phenyl-4H-s-triazolo[4,3-

a][1,4]benzodiazepine of melting point 125 -126.5 C.

and 208.5209.5 C. The second crop was 1.51 g. of the same double melting point. The sample was dried at 100 C. to get rid of methylene chloride and obtain the solvent-free product.

Anal. calcd. for c i-i clmo c 66.58; H. 3.6 Found: C. 66.64; H. 3.6

3; Cl. 9.83; 4; Cl. 9.90: N. 15.70.

EXAMPLE 6 1 -(4-Pyridyl )-6-(o-chlorophenyl )-4H-s-triazolo-[ 4.3- a][ 1,4]benzodiazepine A mixture of l.3-dihydro-5-(o-chlorophcnyl)-2H- l.4-benzodiazepine-2-thione (5.73 g. 0.02 mole). isonicotinic acid hydrazide (8.23 g.. 0.06 mole) and 200 ml. of n-butyl alcohol is refluxed for 18 hours. The solution is evaporated to dryness to give a solid crystalline product. This product is dissolved in water, filtered and dried to give 7 g. of 1-(4-pyridyl)-6-(ochlorophenyl-4H-s-triazolo-[4,3 a][ 1,4]benzodiazepine, .which is recrystallized from methanol-ether to give 5.9 g. of the purified product of melting point 235236C. The analytical sample has a melting point 234235C. on further recrystallization from methanol-ether.

Anal. calcd. for C ,H ClN .1/3 H O:

C.66.76;H.3.91;Cl.9.38;N.18.54. Found: C. 67.00; H. 3.92; Cl. 9.47; N. 18.63.

EXAMPLE 7 8-Chloro-1-(2-thienyl)-6-phenyl-4H-s-triazolo-[4.3- a][1,4]benzodiazepine A. 97-Chloro-1,3-dihydro-5-phenyl-2H-1.4- benzodiazepine-Z-ylidene)-2-thiophene carboxylic acid hydrazide Anal. calcd. for C H CINDS:

C. 60.83; H. 3.38; N. 14.19; Cl. 8.98. Found: C. 60.59. H. 3.87; N. 14.17; Cl. 9.10.

B. 8-Chloro-1-(Z-thienyl)-6-phenyl-4H-s-triazolo[4.3-a]- [1,4]benzodiazepine (7-Chloro-l ,3-dihydro-5-phenyl-2H- 1 ,4- benzodiazepine-Z-ylidene)-2-thiophenecarboxylic acid hydrazide (6.2 g.. 0.016 mol.) is dissolved in ml. of

9 n-butanol and refluxed for 65 hours to give 7.3 g. of 8- chloro-l -(2-thienyl)-6-phenyl-4H-s-triazolo[4,3- a]ll,4]benzodiazepine as a crude oil which solidifies on standing. Recrystallization from ethyl acetatehexane gives 3.85 g. of white needles of melting point 173-179 C.

Anal. calcd. for C ,,H,;,C|N,S:

C, 63.74; H, 3.48; N, 14.87; Cl, 9.41. Found: C, 63.53; H, 3.48; N, 14.74; Cl, 9.48.

EXAMPLE 8 I 8-Chloro-1-(2-thienyl)-6-(o-chlorophenyl)-4H-striazolol4,3-a][1,4]benzodiazepine A mixture of 7-chloro-5-(o-chlorophenyl)-1,3-

mol.) and-Z-thiophenecarboxylic acid hydrazide (8.52 g., 0.06 mol.)is refluxed in 200 ml. of n-butanol for 98 hours cooled to. room temperature and concentrated in vacuo to a yellow solid. This solid is washed with water and ether and dried to give 5.99 g. of 8-chloro-1-(2- thienyl)-6-(o-chlorophenyl)-4H-s-triazolo[4,3-

a][1,4]benzodiazepi'ne as a white powder of melting point 250-25 8 C. Recrystallization from chloroformmethanol gives an analytical sample of melting point Anal. calcd. for C H chMS:

C, 58.40; H, 2.94; N. 13.62; C1, 1724 Found: C, 58.44; H, 2.98; N. 13.72; Cl, 17.40.

EXAMPLE 9 8-Chloro1-(2-pyridyl)-6-phenyl-4H-s-triazolo-[4,3- a][1,4]benzodiazepine-S-oxide A stirred solution of 8-chloro-1-(2-pyridyl)-6- phenyl-4H-s-triazol0[4,3-a][1,4]benzodiazepine (3.0

'millimoles) in absolute ethanol in an ice bath was treated with perbenzoic acid (6.0 millimoles). The mixture was allowed to stand in the ice bath for 12 hours and then at room temperature (about 24 C.) for 18 hours. It was then concentrated in vacuo, the residue suspended in aqueous cold, dilute potassium carbonate solution and extracted with methylenechloride. The

extract was washed with water, dried and concentrated in vacuo to give .8-chloro-1-(2-furyl)-6-phenyl-4H-striazolo[4,3-a][1,4]benzodiazepine--0xide.

EXAMPLE '10 8-Chloro-1-(2-furyl)-6-phenyl-4H-s-triazolo-[4,3- a][ l ,4lbenzodiazepine-S-oxide at room temperature (about 24 C.) for 18 hours. It was I dihydro-2H-1,4-benzodiazepine-Z-thione (6.4 g., 0.02

then concentrated in vacuo, the residue suspended in aqueous cold, dilute potassium carbonate solution and extracted with methylene chloride. The extract was washed with water, dried and concentrated in vacuo to give 8-chloro-1-(2-furyl)-6-phenyl 4H-s-triazolo[4,3- a][1,4]benzodiazepine-5-oxide.

In the manner illustrated in Examples 9 and 10, other N-oxides of compounds of formula II are made by reacting such compounds with organic peracids.

Treating the compounds of formula, 11 or N-oxide of formula 11 compound with pharmacologically acceptable acid such as hydrochloric, hydrobromic, phosphoric, sulfuric, 'actic, 'propionic, toluenesulfonic, methanesulfonic, tartaric, citric, lactic, malic, maleic, cyclohexanesulfamic acids produces the pharmacologically acceptable salts of these compounds of formula 11 which can be used like the free base compounds of formula 11 and the N-oxides thereof. Salt formation is achieved'in conventional manner by reacting the compounds of formula 11 (including 11A and 118) or N- oxides thereof with excess of a selected acid in a suitable medium e.g.-water, a lower alkanol, ether, or acetone and recovering the salt by evaporating the solvent, preferably in vacuo. i

I claim:

1. A compound selected from the group consisting of l,6-disubstituted-4H-s-triazolo[4,3- a][l,4]benzodiazepine of the formula 11 wherein R is an aromatic heterocyclic ring radical selected from the group consisting of 2-, 3-, and 4- pyridyl, 2-thienyl, and 2-furyl; wherein R, is hydrogen or alkyl of one to three carbon atoms, inclusive; and wherein R R R and R are selected from the group consisting of hydrogen, halogen, nitro, trifluoromethyl, and alkylthio in which alkyl isdefined as above; the 5- N-oxides and the pharmacologically acceptable salts thereof.

2. A compound according to claim 1 of the formula llA wherein R is selected from the group consisting of 2-, 3-, and 4-pyridyl and wherein R R R and R is selected from the group consisting of hydrogen, halogen, and nitro, and the pharmacologically acceptable acid addition salts thereof and the 5-N-oxides thereof.

3. A compound according to claim 1 of the formula:

wherein R'is selected from the group consistin of 2-, 3-, and 4-pyridyl; and wherein R and R are selected from hydrogen and halogen, and the pharmacologically acceptable acid addition salts thereof.

4. A compound according to claim 3 wherein R is 2-pyridyl, R is hydrogen. R is chloro and the compound is therefore 8-chlo'ro-6-phenyl-l- (2-pyridyl)- 4H-s-triazolo-[4,3-a][1,4]benzodiazepine.

5. A compound according to claim 3 wherein R is 3-pyridyl, R is hydrogen, R is chloro and the compound is therefore 8-chloro-6-phenyl-l-(3-pyridyl)- 4H-s-triazolo-[4,3-a][1,4]benzodiazepine.

6. A compound according to claim 3 wherein R is 4-pyridyl, R is hydrogen, R is chloro and the compound is therefore 8-chloro-6-phenyl-l-(4-pyridyl)- 4H-s-triazolo[4,3-a][ l ,4]benzodiazepine.

7. A compound accordingto claim 3 wherein R is 4-pyridyl, R is chloro, R is chloro and the compound is therefore 8-chloro-6-(o-chlorophenyl)-l-(4- pyridyl)-4H-s-triazolo[4,3-a][1,4]benzodiazepine.

8. A compound according to claim 1 wherein R is 2- furyl R is hydrogen, R is chloro and the compound is therefore 8-chloro-6-phenyl-l-(2-furyl)-4H-striazolo[4,3-a][1,4]benzodiazepine.

9. A compound according to claim 1 wherein R is 2- thienyl, R R and R are hydrogen, R is 8-chloro and the compound is 8-chloro-1-(Z-thienyl)-6-phenyl-4H-striazolo[4,3-a][ l,4]-benzodiazepine.

10. A compound according to claim 1 wherein R is '2-thienyl, R and R are hydrogen R is o-chloro, R is 8-chloro and the compound is 8-chloro-l-(2-thienyl)- 6-(o-chlorophenyl)-4H-s-triazolo[4,3-

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT N0. 3,856,802 DATED 24 December 1974 INVENTOR(S) Jacob Szmuszkovicz It is certified that error appears in the ab0ve-identified patent and-that said Letters Patent is hereby corrected as shown below:

Column 3, line 56, "methyl sh0u1d be deteted; line 57,pheny1]" should read --pheny1--.

- Signed and Scaled this Twenry-ninrh D a y Of September I98! [SEAL] .4 Rest:

GERALD J. mossmcnore Arresting Oflicer Commissioner 0 f Parents and Trademarks UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,856,802 Dated December 24, 97

Inventor) Jacob Szmuszkovl cz It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, l i ne 32, "I I should read I l l Column 2, l i ne 5, l-N" should read 5-N l i ne 40, "-4-H-" should read -4H- Column 7, l i ne 52, "97.56" should read (7.56 Column 8, l i he 57', "97-" should read (7- Column 9,

l i ne 55, "C12" should read C1 Column 10, l i ne 26..

"acti c" should read acetic Signed and Scaled this Nineteenth Day of October 1976 [SEAL] RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner oflarenrs and Trademarks 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1,6DISUBSTITUTED-4H-S-TRIAZOLO(4,3-A)(1,4)BENZODIAZEPINE OF THE FORMULA II
 2. A compound according to claim 1 of the formula
 3. A compound according to claim 1 of the formula:
 4. A compound according to claim 3 wherein R'' is 2-pyridyl, R2'''', is hydrogen, R4'''' is chloro and the compound is therefore 8-chloro-6-phenyl-1-(2-pyridyl)-4H-s-triazolo-(4,3-a)(1, 4)benzodiazepine.
 5. A compound according to claim 3 wherein R'' is 3-pyridyl, R2'''' is hydrogen, R4'''' is chloro and the compound is therefore 8-chloro-6-phenyl-1-(3-pyridyl)-4H-s-triazolo-(4,3-a)(1, 4)benzodiazepine.
 6. A compound according to claim 3 wherein R'' is 4-pyridyl, R2'''' is hydrogen, R4'''' is chloro and the compound is therefore 8-chloro-6-phenyl-1-(4-pyridyl)-4H-s-triazolo(4,3-a)(1, 4)benzodiazepine.
 7. A compound according to claim 3 wherein R'' is 4-pyridyl, R2'''' is chloro, R4'''' is chloro and the compound is therefore 8-chloro-6-(o-chlorophenyl)-1-(4-pyridyl)-4H-s-triazolo(4,3-a)(1, 4)benzodiazepine.
 8. A compound according to claim 1 wherein R is 2-furyl R2 is hydrogen, R4 is chloro and the compound is therefore 8-chloro-6-phenyl-1-(2-furyl)-4H-s-triazolo(4,3-a)(1,4)benzodiazepine.
 9. A compound according to claim 1 wherein R is 2-thienyl, R2, R3, and R5 are hydrogen, R4 is 8-chloro and the compound is 8-chloro-1-(2-thienyl)-6-phenyl-4H-s-triazolo(4,3-a)(1,4)-benzodiazepine.
 10. A compound according to claim 1 wherein R is 2-thienyl, R3 and R5 are hydrogen R2 is o-chloro, R4 is 8-chloro and the compound is 8-chloro-1-(2-thienyl)-6-(o-chlorophenyl)-4H-s-triazolo(4,3 -a)(1,4)benzodiazepine. 